Using the data in Problem 6.30 and Equations 6.15, 6.16, and 6.18a, generate a true stress-true strain plot for stainless steel. Equation 6.18a becomes invalid past the point at which necking begins; therefore, measured diameters are given in the following table for the last three data points, which should be used in true stress computations?

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Load Diameter Length in. Ibf in. mm mm 159,500 35,850 54.864 2.160 12.22 0.481 151,500 34,050 124,700 28,000 55.880 2.200 11.80 0.464 0.419 56.642 2.230 10.65